1.  Marriage Record:

2.  1840 Census Index/Images (online at Ancestry.com, Image #19-20 of 28; extracted by Diana Gale Matthiesen):

1840

MA

Berkshire Co.

Williamstown

Roll M704_175

pp. 124B-125A

Ln. 16

Mark Hopkins

200 101 - 020 012

0000001

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	4 or under	1835-1840	= Henry (b. 1837/8) = Son A
1 male	15-19	1820-1825	= ?
1 male	30-39	1800-1810	= Mark (b. 1802)
2 females	5-9	1830-1835	= Caroline (b. 1835/6) = Mary (b. 1833/4)
1 female	20-29	1810-1820	= Mary (b. 1813)
2 females	30-39	1800-1810	= ? = ?
1	person employed in learned professions and engineers

Given their social class, the extra individuals were likely servants.  Listed two lines from Samuel KELLOGG.

3.  1850 Census Index/Images (online at Ancestry.com; Image #60 of 63):  Williamstown, Berkshire Co., MA, Roll M432_305, p. 174B, 478/491, enumerated 18 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Mark Hopkins	48	M		Pres Wm College		Mass
Mary       "	36	F				"
Mary L     "	16	F				"
Caroline H "	14	F				"
Henry      "	12	M				"
Archibald  "	8	M				"
Amos L     "	6	M				"
Alice      "	4	F				"

4.  1860 Census Index/Images (online at Ancestry.com, Image #50-51 of 65):  Williamstown P.O., Williamstown, Berkshire Co., MA, pp. 503-504, PN 329-330, 2623/2629, enumerated 6 Sep 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Mark Hopkins	58	M		Pres Wm Coll	1500	20,000	Mass
Mary       "	47	F					"
Henry      "	21	M		Student			"
Loisa      "	25	F					"
Caroline H "	23	F					"
Archibald  "	18	M					"
Amos L     "	16	M		Scholar			"
Alice      "	14	F					"
Mark       "	9	M					"
Susan      "	6	F					"
Mary Gardner	87	F					"
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Sarah Nelson	23	F		Dom			Ireland
Nancy Hogg	20	F		"			"
Sarah Gardner	45	F					Vt

5.  1870 Census Index/Images (online at Genealogy.com, Image #30 of 90 — indexed "Frank Hopkins"):  Williamstown P.O., Williamstown, Berkshire Co., MA, Roll 602 (Book 1), p. 804B, PN 30, 216/227, enumerated 18 Jun 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Hopkins Mark	68	M	W	Pres of College		75,000	Mass
_______ Mary	55	F	W	Keeping House			Mass
_______ Mark Jr	19	M	W	Student in College			Mass
Fortune? Wm	16	M	W	Waiter			Virginia
Houck Eliza	19	F	W	Domestic			Ireland

6.  1880 Census (indexed at FamilySearch.org; page image online at Ancestry.com, Image #18 of 54):  Williamstown, Berkshire Co., MA, Roll T9-0522, p. 474B, PN 18, SD 60, ED 61, enumerated 1 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

8

9

10

13

24

25

26

154

185

Hopkins Mark

W

M

78

/

Prof in College

MA

MA

MA

_______ Mary H

W

F

66

Wife

/

Keeping House

MA

CT

MA

_______ Mary L

W

F

46

Dau

/

At Home

MA

MA

MA

_______ Susan S

W

F

25

Dau

/

At Home

MA

MA

MA

7.  1890 Census:  the 1890 Census Population Schedules were destroyed.

8.  Timothy Hopkins.  1932.  John Hopkins of Cambridge, Massachusetts, 1634, and Some of His Descendants.  Stanford Univ. Press, Stanford, CA.

9.  Encyclopedia Britannica CD 98:

Mark Hopkins (b. Feb. 4, 1802, Stockbridge, Mass., U.S.--d. June 17, 1887, Williamstown, Mass.), American educator and theologian of whom U.S. President James A. Garfield, a former student, once declared, "I am not willing that this discussion should close without mention of the value of a true teacher. Give me a log hut, with only a simple bench, Mark Hopkins on one end and I on the other, and you may have all the buildings, apparatus, and libraries without him." Hopkins graduated from Williams College, Williamstown, Mass., in 1824 and from Berkshire Medical College, Pittsfield, Mass., in 1829.  He practiced medicine briefly in New York City, but in 1830 he returned to Williams, where he instructed the senior class in moral philosophy and rhetoric and, from 1836 to 1872, served as president of the college.  Although he had no formal training in theology, he was ordained a Congregationalist minister in 1836.  His strong religious convictions were reflected in his teachings, which stressed piety and moral values as much as, or even more than, intellectual achievements.  He also emphasized self-education, preferring the Socratic method of teaching to more dogmatic or didactic forms, and placed great importance on material prosperity, which he believed should be treated with the responsibility of Christian stewardship.  His influence spread beyond the college when a series of lectures he delivered at the Lowell Institute in Boston were published in Lectures on the Evidences of Christianity (1846), Lectures on Moral Science (1862), The Law of Love and Love as a Law (1869), and An Outline Study of Man (1873), all of which went through several editions.